#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main()
{
    /*打开文件*/
    const char *filename="./record.txt";
    int fd=open(filename,O_RDWR|O_CREAT,0644);
     if(fd==-1)
    {

        perror("open error:");
        exit(-1);
    }
    printf("fd=%d\n",fd);

    const char *buffer="hello world!!!";
    int writeBytes= write(fd,(void*)buffer,strlen(buffer));
    printf("writeBytes=%d\n",writeBytes);
    close(fd);



    return 0;
}